NULL pointer dereference in Unzip Project
CVE-2021-4217
A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (47.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Unzip Project — versions 6.0
- Fedoraproject Fedora — versions 35
- Red Hat Enterprise Linux — versions 6.0, 7.0, 8.0
- Unzip — versions unzip 6.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- bugzilla.redhat.com/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-4217 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4217?
- CVE-2021-4217 is a low-severity vulnerability in Unzip Project, classified under NULL Pointer Dereference. CVSS score: 3.3/10. Published 2022-08-24.
- How severe is CVE-2021-4217?
- Low severity. CVSS v3 base score is 3.3 out of 10.
- Is CVE-2021-4217 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.